Tamping device for use in molding operations



i March 25, 1930.

F. BREEDEN TAMPING DEVICE FOR USE IN MOLDING OPERATIONS Original Filed Feb, 5, 1928 2 Sheets-Sheet l zmcwreeden y auf img.

has orlzey March 25, 1930. F. BREL-:DEN 1,751,465

TAMIsI-NG DEVICE FOR USE IN MOLDING OPERATIONS Original Fild F'eb. 5, 1928 2 Sheets-Sheet 2 l fvwm/cw reedeiz' Patented lidar. 930

Uairsnfx-, s'rA'rss 1 tesina PATENT @Frio E* f FRANCIS BREEDEN, or BIRMINGHAM, ENGLAND, AssIcrNoR To AUTOMATIGYMULDING v MACHINES LIMITED, or' BIRMINGHAM, ENGLAND TAMPING DEICENFOR' USE IN MOLDING OPERATIONS Original application ledFebruary 3, 1928, Serial No.u251,613, and in Great Britain February 8, 1927. Div'dedand'tliis application filed March 2,1, 1929. Serial No. 348,891.

This invention has reference to improvements in or relating to tamping devices for use in molding operations and is concerned more particularly with tamping devices especially suited for use in conjunction with the machinery to be employed in making molds for casting metal described and claimed in my divisional patent application Serial Number 251,613, filed February 3rd, 1928.

The invention consists of an improved tamping device for use in molding operations and comprises a frame, a plurality of tamping to-ols for effecting the consolidation of the sand fed on to the pattern said tamping tools being mounted forvreciprocation within the frame, means for effecting a positive lifting of the tamping tools at intermittent periods the tamping tools being capable of a limited free rising and falling motion independently of the said lifting means. Y

The invention will now be'described with particular reference to the accompanying sheet of drawings, wherein Figure 1 isa part sectional side elevation of a portion of the molding machine described in the specification of my aforesaid divisionalpatent application andshewing two sets of Jramping means embodied therewith.-

VFigure 2 is an an end elevation of the tamping means seen in Figure 1 together with the adjacent portions'of the molding machine.

As illustrated in the drawings the ramming or tamping devices consist of a plurality of vertically disposed spindles 16'3 which pass and work through coincident holes in pairs of horizontal guide bars 16d extending transversely across the machine. The bars 16d are connected by side members 16e which form therewith a frame-like structure, the said side bars 16e being grooved to engage vwith vertical guide bars 9d carried by the rframing 9 of the machine as is best seen in Figure 2.

The frame-like structures constituted by the bars 16d and '16e are adapted to have a rising and falling motion communicated to them by theaction of tappet wheels 35 or like devices mounted on spindles 35a crossing the upper end of the framing 9. The spindles 35 are rotated continuously through belt or other gearing. The aforesaid tappet wheels are located so as to contact with projections l 16f which-arepreferably in the form of rollers and which are carried by upwardly veX- tending rods secured to the frame-likestructures. v The'spindles 16c of the ramming or tamping tools `are weighted attheir upper vends and are provided with iixedcollars 16h adapted to bear normally against the upper side or face of the lower. transverse barv16d of the frame-like structure.

Thus while the spindles are yraised bythe said frame .on its 'upward motion, theV said-spindles andtools Acarried thereby in their descent can, on contact with the sand, rise relatively to the guide frame and subsequently make their percussive blows free from vrestraint by the guide frame.v y `1 Normally the frame-like structures and the .tamping tools carried thereby are retained in a raised and non-acting position by the engagementV below the frame members of a projecting arm 36 carried by a swivelling rod or member 362L suitablyfmounted on the fram-v ing 9 of the machine adjacent each tool carryingy frame,A the said 'rod having thereon a second projecting armtb which extends into the path of aside `projection 13C- on the carriage 13. It will be understood thatas the carriage passes below each tampingdevice in succession` the action vof the part 13c Aon the projection 36h on the respective rods 36rc1 willturn the arms 36 thereof out of the supporting or retaining position the frames bef ing then permitted to rise and fall under the action of the tappets.' The turningmotion of the rod 36?' is` effected against the action of a spring (not sheWn) `which serves to returnthe rod to -the normal position in which its arm 36 supports the frame structureafter ythe carriage in itsforward motion has passed the projection 36h.

The lower or acting ends of the series of tools may be given any suitable shape a hemispherical shape being found effective in practice and the said'acting ends may conveniently be constituted by resilient sponge rubber balls 16k. the said balls 16k being secured in inverted cup-like sockets 16m provided on the lower ends of thespindles 16a but the said acting Aso ends may,rif desired, be of metal or other suitable material.

The tamping tool which operates after the flask or half mold has passed below the third or last sandhopper may, if desired, be a single tool having a width approximately equal to or but slightly less than the internal width of the fiask said tool being mounted in a guide fiame adapted for reciprocation in the manner hereinbefore referred to with reference to the tools 16e.

Claims:

l. A tamping device for use in molding operations comprising a base, a support for the molding boX and pattern plate, a pair of standards supported from said base, guideways, formed in said standard, a rectangular frame slidably mounted in said guideways, aligned bearings formed in the upper and lower transverse bars of the frame, vertically disposed tamping tools slidably mounted "within said bearings, means for permitting the molding box and pattern plate, a pair of standards supported from said base, guideways formed in said standards, an open rectangular frame slidably mounted within said guideways, aligned bearings formed inthe upper and lower transverse bars of the frame, vertically disposed rods slidably mounted within said frame, tainping heads fixed to the 'lower ends of said rods, means for permitting lof a limited free rising and falling motion of the spindles relatively to the frame whereby the tamping heads can adjust themselves relatively to the contour of the pattern and Y means for eecting a positive lifting-at inter mittent periods of the frame and tamping tools carried thereby said frame subsequent lto a lifting operation being capable of falling 'under the action of gravit-y to allow the tamping tools to Veffect thel consolidation of the sand inthe molding'boX.

3. A tamping device for use in molding loperations comprising a base7 a support for the molding box and pattern plate, a pair of standards supported from the base, guideways formed in said standards, an open rectan gular frame slidably mounted in the guideways, aligned bearings formed in the upper and lower transverse bars of the frame, verltically disposed rods slidably mounted within the said bearings, tamping heads secured to the lower ends of said rods, means for per- 'mitting of a limited free rising and falling motion of the rods relatively to the frame so as to admit of the tamping heads conforming automatically to the contour of the pattern, a projection carried by said frame, a rotatable tappet wheel adapted to come into contact with the said projection at intermittent periods for effecting a lifting of the frame and tan'iping tools carried thereby and means for effecting a rotation of the tappet wheel, the frame and tamping tools, subsequent to a y lifting operation, being adapted to fall under the action of gravity whereby the tamping heads are enabled to effect theconsolidation of the sand in the molding boX.

ln testimony whereof, I have signed my name to this specification.

FRANCIS BREEDEN. 

